You'll be directed to your new home page the next time you log in. You can change your personal home page at any time.

Alternatively, if your Confluence administrator has set a space home page as the landing page for the whole site, you can choose Dashboard from the Site Homepage drop down to use the dashboard as your landing page.

Screenshot: Profile Settings

You can access the dashboard at any time using the dashboard URL. It'll look something like this: https://yoursite.com/wiki/dashboard.action.